A.R.I. Eliptix W-30 WR 2W, Установка, эксплуатация и обслуживание, Страница: 10 / 15

W-30 WR 2W
2.3. The Control Loop of the Pressure Reducing Application
The following is a general description of the Control Loop of the pressure reducing application:
The W-
30
WR Dual Set Point Pressure Reducing Valve is designed to reduce a higher upstream pressure to one of two
preset lower downstream pressure set points, and to maintain this constant pressure regardless of flow-rate or
upstream pressure fluctuations. The selection between the two set points is done by position of a solenoid, which is
connected to a controller.
Depending on the opening stat of the solenoid, pipeline water flows constantly through the control loop of the active
pilot valve. The active pilot senses the downstream pressure through its #
1
port.
When the downstream pressure is higher than the pilot's pressure settings, the pilot increases the internal pressure of
the control chamber by increasing the water flow through port #
3
, causing the valve's diaphragm to slightly close and
decrease the downstream pressure back to the required settings level.
When the downstream pressure is lower than the pilot's pressure settings, the pilot decreases the internal pressure of
the control chamber by decreasing the water flow through port #
3
, causing the valve's diaphragm to slightly open and
increase the downstream pressure back to the required settings level.